Just got one of these ... plugs onto tool batteries for USB charging. Good use of tool batteries i thought.
Festival / camping / emergency charger
Submitted 2 weeks ago by plord@u3a.social to u3acommunitiescomputing@u3a.social
Submitted 2 weeks ago by plord@u3a.social to u3acommunitiescomputing@u3a.social
Just got one of these ... plugs onto tool batteries for USB charging. Good use of tool batteries i thought.
plord@u3a.social 3 days ago
First round of testing completed.
4Ah robi battery lasts for 3 phone charges.
5Ah robi battery lasts for 4 phone charges.
I guess not surprising.
With a 4Ah (18v) battery and a phone battery of 5Ah (3.8v). Number of charges = (4x18)/(5x3.8) = 3.7 (minus losses)
Might need to get a bigger robi battery for festival use ....